| 摘要 |
1,246,723. Polymerization; polyethylene glycol esters. WALLACE & TIERNAN Inc. 23 Jan., 1969 [8 March, 1968], No. 4017/69. Headings C3G, C3P and C3R. [Also in Division C2] Polymers of the formula are obtained by stirring and irradiating with a sun lamp either a slurry of a copolymer of methyl vinyl ether and maleic acid and di-t-butyl diperoxyfumarate in benzene or an acetone solution of the reactants. Polymers of the Formula XVI above, in which x and y are from 10 to 500, are obtained by a similar process using an acetone solution of polyvinyl acetate and di-t-butyl diperoxyfumarate. In Example 7, polymers of the formula in which m+n is 10 to 16 are obtained by slowly adding a pentane solution of di-t-butyl diperoxyfumarate to a polyethylene glycol at a temperature of 24‹ C. with stirring and irradiation with a sun lamp. The polymer adduct thus obtained may be used to initiate styrene polymerization at 100‹ C. to give a mixture of polystyrene homopolymer and a polyethylene glycol-polystyrene graft copolymer with the probable structure wherein m+n is 10 to 16 and x and y are from 10 to 500. The polystyrene homopolymer may be removed from the mixture by extraction with benzene. Polystyrene is obtained by polymerizing. styrene in the presence of the following peroxide initiators: di-t-butyl alpha-(2-tetrahydrofuryl)- diperoxysuccinate, di - t - butyl alpha - butyryldiperoxysuccinate, and t-butyl 3-(t-butylperoxycarbonyl) - 4 - methyl - 4 - isopropoxyvalerate. |
